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Then multiply by the density of the material you are going to put down. I used to have a chart somewhere that listed all of these but as a guestimate use the following and you won't be miles away:
soil = 1.8t/m3
type 1 = 2.2t/m3 (to allow for compaction)
concrete = 2.5t/m3
tarmac = 2.8t/m3
gravel = ? (2.0t/m3?)
All of the above are based on dry weights, its gonna weigh more if its wet!
i.e. 2.7m3 of gravel X 2.0t/m3 = 5.4 tonnes needed
GORDON said:
Doesn't it depend where Ben is going to put his gravel/bark as to what thickness he'll require. I recently replenished some paths at a place -- scraped off the rubbish - (compacted sand underneath) and topped up with new 10mm gravel. The bloke at the gravel shop said he'd advise 2" deep for a path - but I only bought enough for about 3/4" - this was plenty - much more and it would have made it difficult to walk on - you know - sort of swimming underfoot.